An online auction started this morning, providing a chance to win a meet & greet with Paul McCartney and tickets to his 10/5 show in Sacramento. Proceeds benefit City of Hope/Songs of Hope. Remember: The annual Songs of Hope dinner event takes place tomorrow at Ron Fair's L.A. home.

There, a silent auction will also take place. Attendees can bid for signed guitars from Imagine Dragons (seen right, signing), Paul Simon, Taylor Swift, Shawn Mendes, Heart, Slash and many more. Word has it that there's also a John Lennon drawing print signed by Yoko Ono, along with other drawings and experiences.